If the country is updated, we don't want to blank the region, if the region is updated we don't want to blank the country.
Note the different formats for the country and delivery_country checkout properties.
Merge remote-tracking branch 'upstream/master' into pr-1468-validate-country-region-dont-blank-on-other-field-change

Conflicts:
	wpsc-components/theme-engine-v1/helpers/ajax.php
Merge pull request #1469 from JeffPyeBrook/pr-1468-validate-country-region-dont-blank-on-other-field-change

If the country is updated, we don't want to blank the region